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Retirement and Benefit Plans (Tables)
3 Months Ended
Mar. 31, 2015
Compensation and Retirement Disclosure [Abstract]  
Retirement and Benefit Plans [Table Text Block]
The following table presents the pension benefit costs:
 
 
Three Months Ended
March 31
 
2015
 
2014
 
(thousands)
Service cost
$
475

 
$
401

Interest cost
4,707

 
5,151

Expected return on plan assets
(5,200
)
 
(5,268
)
Amortization of actuarial (gain) loss
1,599

 
(6
)
Plan settlement loss
501

 

Net periodic benefit cost
$
2,082

 
$
278